50mm or 56mm objective?

I plan on buying a nightforce nxs 3.5-15x rifle scope, problem is i cant decide which one to go with 50 or 56 mm, they are both the same price, so that isn't an issue. I know that a bigger objective lets in more light therefore better in low light situations, but how much more? and is the added height that is needed worth it? the gun i am getting to go under it does have an adjustable comb... as I'm writing this im being swayed towards the 56... but still I would greatly appreciate your input, as Im am exceptionally green to LRH and everything it entails. Also, any input on the available reticles (NP-R1/2, MLR and Mil dot, although im not very partial to the mildot). oh yeah, there website doesnt say which pane or lens the reticle is on, any help there would also be appreciated.
Thanks in advance, Evan

yeah i definitely dont have 2400 to buy a FFP scope from them, any idea how wide the actual has mark is? like how it translates to MOA? Ive tried to call and email but I get either a busy tone or an email saying they are getting way to many emails, any help would be great.
Thanks, Evan

it depends on the use If you are going to pack it from the truck to the bench and back to the truck the 56 would be OK If you plan on packing it around with a sling and hunting with it I would go with the 50 I personaly wish they would make one with a 44.

yeah, ive pretty much decided to go with the 56. thanks again for all the input, but for what im using it for, target and the odd hunting trip the 56 will be great. 270win, to build off your little saying, opinions are like a**holes, everyone has one, and everyone thinks everyone else's stinks. (youve probably heard that though)
Thanks, Evan

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